Neclib

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
Bug Fixes
* Validate negative speed by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/403
New Features
* Add observation spec parser by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/406


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.21.1...v0.21.2

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
New Features
* Add finiteness indicator of control section by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/401


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.21.0...v0.21.1

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
New Features
* Fully implement linear path with acceleration by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/399


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.20.3...v0.21.0

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
Bug Fixes
* Fix return and tracking order by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/395
* Fix missing support for offset-coordinate by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/397


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.20.2...v0.20.3

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
New Features
* Add coordinate generator handler by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/393


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.20.1...v0.20.2

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
Bug Fixes
* Fix invalid assignment of target speed by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/389
New Features
* Add error handler for zero-margin acceleration by KaoruNishikawa in https://github.com/necst-telescope/neclib/pull/385


**Full Changelog**: https://github.com/necst-telescope/neclib/compare/v0.20.0...v0.20.1